JP2019211638A - Processing device, output device, synchronization control system, and these control methods, as well as programs - Google Patents

Abstract

To provide a processing device, output device, synchronization control system, and these control methods, as well as these programs that, when a reference device transits to a separate synchronization group, can prevent disturbance of synchronization processing in other processing device of an original synchronization group.SOLUTION: A display device 200c to be connected to each of imaging devices 100a and 100b via an IP network 400 is configured to, when switching a video signal of an image display object to a video signal from the imaging device 100b upon performing a display of an image based on a video signal from the imaging device 100a in synchronization with other display device of a synchronization group A as a reference device of the synchronization group A, transmit report information relevant to a display time of a video signal from the imaging device 100a to the imaging device 100a until an own device is no longer the reference device of the synchronization group A.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a processing device that receives a video signal via a network, an output device that transmits the video signal, a synchronization control system, a control method thereof, and a program.

  A technology for converting a video signal into Internet Protocol (hereinafter referred to as IP) and transmitting / receiving via a Local Area Network (hereinafter referred to as LAN) cable will be widely used in the future due to convenience such as facility expansion. It is assumed that The receiving device that processes the video signal transmitted by IP is, for example, a display device that displays an image using the video signal, or a recording device that records the video signal on a recording medium. In addition, video signals output from the same output device can be received and processed by a plurality of receiving devices.

  Patent Document 1 discloses a transmission system that outputs image and audio data from a relay device to a plurality of terminals in a synchronization group and reproduces content data such as image and audio data acquired by each terminal. In this transmission system, the relay apparatus acquires a delay time of transmission between each terminal, and sets a standby time to wait until the content data is received by each terminal and reproduced. As a result, it is possible to suppress the variation in timing at which the transmitted content data is reproduced at a plurality of terminals and reproduce the data in synchronization.

  Further, in the transmission system of Patent Document 1, when some terminals (processing devices) leave the synchronization group, the standby time may be set again based on the delay time of the remaining terminals. If the standby time of another terminal is set so as to match the playback timing of the terminal (reference device) having the longest transmission delay among the terminals before leaving, synchronization is performed in accordance with the reference device leaving the synchronization group. Set a new reference device for the group. Thereby, the standby time of each terminal is reset according to the newly set playback timing of the reference device.

  Further, Patent Document 2 discloses a technique for avoiding sound skipping due to a change in display delay amount in a system in which video display and audio output are synchronized. Specifically, in the state where no audio is output, the output of the audio is started by synchronizing the video and audio, and in the state where the audio is output, this change occurs when the display delay time changes. The audio output is continued with the display delay time immediately before.

JP 2017-041696 A JP 2007-104030 A

  However, in the techniques of Patent Document 1 and Patent Document 2, when the reproduction timing of the reference device is suddenly changed, the synchronization processing between the terminals other than the reference device in the synchronization group is disturbed and displayed. The image is disturbed.

  Specifically, there are a plurality of synchronization groups including a plurality of terminals and one output device, and a reference device in one synchronization group switches a video reproduced by an operation such as input switching to a video from an output device in another synchronization group. This is the case.

  The present invention relates to a processing device, an output device, a synchronization control system, and a control method thereof capable of preventing disturbance of synchronization processing in another processing device of the original synchronization group when the reference device transitions to another synchronization group, and The purpose is to provide a program.

  The processing apparatus according to claim 1 of the present invention connects a plurality of output devices and performs predetermined processing on a video signal received from any one of the plurality of output devices with other processing of the synchronization group to which the own device belongs. A processing device for performing synchronization with a receiving device, the receiving means receiving a plurality of video signals and a plurality of setting information corresponding to each of the plurality of output devices from the plurality of output devices; and the plurality of video signals A selection means for selecting a video signal to be subjected to the predetermined processing, and a timing based on setting information corresponding to the selected video signal among the plurality of setting information, with respect to the selected video signal Processing means for executing the predetermined processing, and a report related to an execution time of the predetermined processing for the selected video signal by the processing means A transmission means for transmitting a report to the output apparatus that has output the selected video signal among the plurality of output devices, report information transmitted by the transmission means, and a plurality of setting information received by the reception means; And determining means for determining whether or not the own apparatus is a reference device of the synchronization group, wherein the selecting means determines that the video signal for executing the predetermined processing is the video signal among the plurality of video signals. After the first video signal is switched to the second video signal, and when the determination unit determines that the own device is a reference device of the synchronization group of the first output device that outputs the first video signal. The transmission means causes the first output device to execute the predetermined process on the first video signal until the determination means determines that the own device is not a reference device of the synchronization group of the first output device. Related Second report information related to the execution time of the predetermined processing on the second video signal is transmitted to the second output device that outputs the second video signal. It transmits as said report information, It is characterized by the above-mentioned.

  An output device according to claim 5 of the present invention is connected to a plurality of processing devices, and transmits a video signal that is subjected to predetermined processing in synchronization to a processing device in its own synchronization group among the plurality of processing devices. A receiving unit that receives report information from a processing device of the synchronization group of the own device, a determination unit that determines a reference device of the synchronization group of the own device based on the received report information, A first transmission unit configured to transmit the report information from the determined reference device as setting information to the processing device of the synchronization group of the own device; and the plurality of processing devices based on the report information received by the receiving unit. One first processing apparatus is the reference apparatus and determines whether or not it is going to leave the synchronization group of the own apparatus, and the determination means When it is determined that the first processing device is the reference device and is about to leave the synchronization group of the own device, an inquiry means for changing the reference device or inquiring the user, and accepting a user instruction for the inquiry And when the instruction to change the reference device is received as the user instruction by the receiving means, the determining means excludes the first processing device from the processing devices of the synchronization group of the own device. And the first transmission means sends the first setting information including a synchronization group ID having a value other than a value indicating the synchronization group of the own apparatus to the first processing device. And transmitting the synchronization group of the own device to the processing devices other than the first processing device among the processing devices of the synchronization group of the own device. The second setting information including a synchronization group ID is to value and transmits as the setting information.

  A synchronous control system according to claim 7 of the present invention includes a plurality of output devices and a plurality of processing devices, and a first processing device that is one of the plurality of processing devices is connected to the plurality of output devices. A synchronization control system that performs predetermined processing on a video signal received from any one of the plurality of output devices in synchronization with another processing device of a synchronization group to which the own device belongs. First receiving means for receiving a plurality of video signals and a plurality of setting information corresponding to each of the plurality of output devices from the plurality of output devices, and performing the predetermined processing among the plurality of video signals A selection means for selecting a video signal; and a timing based on setting information corresponding to the selected video signal among the plurality of setting information. Processing means for executing the predetermined processing on the signal, and report information related to an execution time of the predetermined processing on the selected video signal by the processing means among the plurality of output devices. Based on the first transmission means for transmitting the output video signal to the output device, the report information transmitted by the first transmission means, and a plurality of setting information received by the first reception means, First determination means for determining whether or not the own apparatus is a reference device of the synchronization group, wherein the selection means determines that the video signal for executing the predetermined processing is the one of the plurality of video signals. After switching from the first video signal to the second video signal, the first determination means determines that the own device is a reference device of the synchronization group of the first output device that outputs the first video signal. Place In addition, the first transmission means outputs the first video signal to the first output device until the first determination means determines that the own transmission device is not a reference device of the synchronization group of the first output device. The first report information related to the execution time of the predetermined process is transmitted as the report information, and the second video signal is output to the second output device that outputs the second video signal. 2nd reception information which transmits the 2nd report information relevant to time as said report information, and receives said report information from a processing device of an own synchronous group among said plurality of processing devices in said 1st output device. Means for determining a reference device of the synchronization group of the own device based on the received report information, and the report information from the determined reference device corresponds to the first video signal Based on the report information received by the second receiving means and the second receiving means for transmitting the setting information to the processing device of the synchronization group of the own device, the first processing device is the reference device and the own processing device. Second determination means for determining whether or not the machine is leaving the synchronization group, and the second determination means is that the first processing device is the reference device and is about to leave the own synchronization group. If it is determined that the reference device is changed, an inquiry unit that inquires the user whether to change the reference device and a reception unit that receives a user instruction for the inquiry are provided. The instruction to change the reference device by the reception unit is used as the user instruction. If accepted, the determination means is a processing device other than the first processing device among the processing devices of the synchronization group of the own device. And the second transmission means uses, as the setting information, first setting information including a synchronization group ID having a value other than a value indicating the synchronization group of the own apparatus. The second setting information including the synchronization group ID that is a value indicating the synchronization group of the own device is transmitted to the processing devices other than the first processing device among the processing devices of the synchronization group of the own device as the setting information. It is characterized by transmitting.

  ADVANTAGE OF THE INVENTION According to this invention, disorder of the synchronous process in the other processing apparatus of the original synchronous group can be prevented when a reference apparatus changes to another synchronous group.

It is a block diagram of the transmission / reception system as a synchronous control system which consists of an imaging device as an output device and a plurality of display devices as processing devices in an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a data format of an IP video signal output from the imaging apparatus in FIG. 1. It is a schematic diagram which shows the data format of the report information and setting information used with the transmission / reception system of FIG. It is a sequence diagram which shows the procedure of the conventional video display synchronous process in the transmission / reception system of FIG. It is a block diagram which shows the functional block of the imaging device in FIG. It is a block diagram which shows the functional block of the display apparatus in FIG. FIG. 7 is a flowchart showing a procedure of synchronization group leaving processing executed in the display device of FIG. 6. FIG. 6 is a flowchart illustrating a procedure of a synchronization group leaving process that is executed in the imaging apparatus of FIG. 5.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 illustrates a plurality of output devices (imaging devices 100a and 100b, hereinafter referred to collectively as an imaging device 100) and a plurality of processing devices (display devices 200a to 200e, hereinafter referred to as these) according to an embodiment of the present invention. Is a schematic diagram showing a configuration of a transmission / reception system (synchronous control system) including a display device 200. The imaging device 100 and the display device 200 are connected via the IP network 400. The connection between the imaging device 100a and the display devices 200a to 200c and the video signal transmission / reception method described below with reference to FIGS. 1 to 4 are the connections between the imaging device 100b and the display devices 200c to 200e. And the video signal transmission / reception method are the same, and redundant description is omitted. In this embodiment, the case where there are two display devices belonging to the IP network 400 in addition to the display device 200c is illustrated, but the present invention is not limited to this. That is, in addition to the display device 200c, there may be one or more display devices belonging to the IP network 400.

  The imaging device 100 and the display device 200 are connected to LAN cables 300a to 300g (hereinafter collectively referred to as the LAN cable 300), and are connected to the IP network 400 via the LAN cable 300. The imaging device 100a and the display devices 200a to 200c transmit and receive RTP packetized video signals via the LAN cables 300a to 300c and the IP network 400.

  In the transmission / reception system shown in FIG. 1, the processes in the display devices 200 a to 200 c are synchronized using a method disclosed in RFC7272 (https://tools.ietf.org/html/rfc7272). The synchronization method will be described later.

  The imaging device 100a is a transmission device that converts a video signal obtained by imaging a subject into an IP and transmits the video signal to the display devices 200a to 200c via the IP network 400. As the IP conversion method, for example, a means for converting to a Real Transport Protocol (RTP) packet described in RFC4175 (https://tools.ietf.org/rfc/rfc4175.txt) is used. In addition, the imaging device 100a outputs information (IDMS Settings Packet, setting information) indicating the timing of display processing so that the plurality of display devices 200a to 200c can execute display processing in synchronization with each other. Details of the setting information will be described later.

  The display devices 200 a to 200 c are reception devices that receive video signals via the IP network 400. The display devices 200a to 200c are display devices that include a display unit that displays an image based on a received video signal. In addition, when the display devices 200a to 200c have a recording function, specifically, when a storage medium is stored inside or when a storage device is connected to the outside, recording is performed to record the received video signal. It is also a recording control device capable of executing control. As described above, in this embodiment, the display devices 200a to 200c display an image based on the video signal from the imaging device 100a and perform recording control of the video signal. However, as long as predetermined processing is performed based on the video signal, the processing performed by the display devices 200a to 200c is not limited to these processing. Further, the display devices 200a to 200c output information (report information) indicating the reception time of the video signal, the time when the image is displayed based on the video signal, and the ID information indicating the synchronization group to which the own device belongs. . Specifically, RTCP XR IDMS Report Block is output as report information. Details of the report information will be described later.

  FIG. 2 is a schematic diagram illustrating a data format of an IP (RTP packetized) video signal output from the imaging apparatus 100. The RTP packet includes an IP header 401, User Datagram Protocol (hereinafter referred to as UDP) header 402, RTP header 403, and RTP payload 404. Among these, the video signal is stored in the RTP payload 404.

  FIG. 3 is a schematic diagram showing a data format of report information and setting information used in the transmission / reception system of FIG.

  FIG. 3A is a schematic diagram showing a part of the data format of report information 500 transmitted from the display device 200.

  The report information 500 includes group ID information 501, reception time information 502, target signal information 503, and processing time information 504.

  The group ID information 501 is a media stream correlation identifier indicating information related to synchronization. The group ID information 501 includes a synchronization group identifier (group information) indicating a synchronization group that performs video display synchronization. Hereinafter, the Synchronization Group Identifier is described as a synchronization group ID. In the transmission / reception system of FIG. 1, since the display devices 200a to 200c synchronize display processing, the synchronization group IDs have the same value.

  The target signal information 503 is information for specifying a video signal (RTP packet) targeted by the report information 500. Specifically, the target signal information 503 is RTP Header time stamp (Packet Received RTP time stamp) described in RFC4175.

  The reception time information 502 is information indicating the time when the display device 200 receives the RTP packet specified by the target signal information 503. Specifically, the reception time information 502 is a Packet Received NTP timestamp defined by RFC7272.

  The processing time information 504 is information indicating the time (execution time) when the display device 200 displayed an image based on the RTP packet specified by the target signal information 503. Specifically, the processing time information 504 is a Packet Presented NTP timestamp defined by RFC7272.

  FIG. 3B is a schematic diagram illustrating a part of the data format of the setting information 600 output from the imaging apparatus 100. The setting information 600 includes group ID information 601, reception time information 602, target signal information 603, and processing time information 604. The setting information output by the imaging apparatus 100 is report information 500 received from the display apparatus determined as the reference apparatus by the imaging apparatus 100 among the report information 500 from the display apparatuses 200a to 200c acquired by the imaging apparatus 100. Accordingly, the details of the group ID information 601, the reception time information 602, the target signal information 603, and the processing time information 604 of the setting information 600 are the same as the information of the same name in the report information 500, and thus the description thereof is omitted.

  FIG. 4 is a sequence diagram illustrating a procedure of a conventional synchronization control process in the transmission / reception system of FIG. 1 including the imaging device 100a and the display devices 200a to 200c.

  Connection between the imaging device 100a and the display devices 200a to 200c is established via the IP network 400 (steps S400a to S400c).

  Each display device 200a to 200c determines a synchronization group ID indicating a synchronization group for synchronizing display processing (steps S401a to S401c). The display device 200a to 200c determines the synchronization group in which each display device 200a to 200c participates, based on information preset for each display device 200a to 200c. Note that the order of establishing the connection in steps S400a to S400c and determining the synchronization group ID in steps S401a to S401c may be reversed.

  Each of the display devices 200a to 200c generates report information 500 for an arbitrary video signal for the imaging device 100a and outputs the report information 500 to the imaging device 100a (steps S402a to S402c). Hereinafter, the report information 500 from each of the display devices 200a to 200c is also referred to as report information 500a to 500c.

  The imaging device 100a receives the report information 500a to 500c output from the display devices 200a to 200c. Thereafter, based on the received report information 500a to 500c, one of the display devices 200a to 200c is determined as a reference device (step S403).

  The imaging device 100a outputs the report information 500 received from the display device determined as the reference device to the display devices 200a to 200c as setting information 600 (steps S404a to S404c).

  Each display device 200a to 200c adjusts the processing time of the display process in each display device 200a to 200c based on the reception time information 602 described in the received setting information 600 and the processing time information 604 (step S405a). ~ S405c). Specifically, each display device 200a to 200c processes the processing time Ta indicated by the processing time information 604 described in the received setting information 600 and the video signal targeted by the received setting information 600 by itself. The difference from the processed time Tb is calculated. Then, an adjustment amount (delay amount) for delaying the processing time in order to synchronize the processing with the reference device is acquired from the calculated difference. Each of the display devices 200a to 200c controls the display process so that the acquired delay amount is added to the processing time.

  Through the above processing, the video signal output from the imaging device 100a is displayed in synchronization between the display devices 200a to 200c.

  In addition, transmission of the report information 500 from each display apparatus 200a-200c is performed with a fixed period. The transmission of report information may be controlled by each of the display devices 200a to 200c so as to be executed at least once within a predetermined period. The imaging device 100a outputs setting information in response to receiving the report information 500 a predetermined number of times or more from each of the display devices 200a to 200c. Thereby, synchronization control is executed periodically or intermittently, and synchronization can be continued even when the transmission time or processing time to each of the display devices 200a to 200c varies.

  FIG. 5 is a block diagram illustrating functional blocks of the imaging apparatus 100. The imaging device 100 includes an imaging unit 101, a packet generation unit 102, a communication unit 103, a reference device determination unit 104, an information generation unit 105, a control unit 106, a storage unit 107, a display unit 108, a resynchronization reception unit 109, and an operation unit. 110.

  The imaging unit 101 captures a subject and acquires a video signal. The imaging unit 101 includes a lens to which an optical image is input, a lens control system that controls the lens, and an imaging sensor that generates image data from the optical image input to the lens. The imaging unit 101 may include an image processing unit that performs predetermined image processing on the video signal output from the imaging sensor. The imaging unit 101 outputs the acquired video signal to the packet generation unit 102.

  The packet generation unit 102 converts the video signal transmitted from the imaging unit 101 into IP, more specifically, RTP packet. The packet generation unit 102 outputs the RTP packetized video signal to the communication unit 103. The packet generator 102 converts the video signal into an RTP packet in a data format as shown in FIG.

  The communication unit 103 is a communication interface for connecting to the LAN cable 300 and transmitting / receiving signals via the IP network 400. The communication unit 103 outputs the RTP packetized video signal received from the packet generation unit 102 to each of the display devices 200a to 200c via the IP network 400. At this time, the communication unit 103 stores, in the storage unit 107, transmission time information in which the information for specifying the transmitted RTP packetized video signal is associated with the time when the video signal is transmitted. Here, the information for specifying the transmitted RTP packetized video signal is RTP Header time stamp (Packet Received RTP time stamp) described in RFC4175.

  In addition, the communication unit 103 acquires report information 500a to 500c from the display devices 200a to 200c via the IP network 400, and outputs the report information 500a to 500c to the reference device determination unit 104 and the information generation unit 105. The communication unit 103 outputs the setting information 600 acquired from the information generation unit 105 to each of the display devices 200a to 200c via the IP network 400.

  The reference device determination unit 104 determines one of the display devices 200a to 200c as a reference device based on the report information 500 received from each of the display devices 200a to 200c included in the same synchronization group. The reference device determination unit 104 acquires the transmission time corresponding to the video signal indicated by the target signal information 503 of the received report information 500 from the storage unit 107. Next, the reference device determination unit 104 calculates a difference between the acquired transmission time and the processing time (display time) indicated by the processing time information 504 of the received report information 500. That is, the reference device determination unit 104 calculates the time (delay amount) from when the video signal is transmitted from the imaging device 100 until it is displayed on the display device 200 that transmitted the report information 500. The reference device determination unit 104 determines a display device having the largest calculated delay amount among the display devices 200a to 200c as a reference device, and notifies the information generation unit 105 of the determined reference device.

  The information generation unit 105 generates setting information 600 based on the report information 500 received from the reference device determined by the reference device determination unit 104. The information generation unit 105 outputs the report information 500 received from the reference device as setting information 600 to the communication unit 103. Each time the information generation unit 105 receives the report information 500, the information generation unit 105 determines whether Empty is described as the synchronization group ID of the report information. If the information generation unit 105 determines that Empty is described, the information generation unit 105 generates setting information 600 in which a synchronization group ID indicating an arbitrary synchronization group that is not Empty is added to the display device 200 that has transmitted the report information 500. . In this embodiment, the information generation unit 105 sets the value of the synchronization group ID indicating any synchronization group that is not Empty to a value other than the values of the synchronization group IDs of the synchronization groups A and B existing in FIG. Is used.

  The control unit 106 is a processor that is connected to each functional block of the imaging apparatus 100 via a bus (not shown) and controls the operation thereof. The control unit 106 is a central processing unit (CPU). The control unit 106 controls the operation of each functional block of the imaging apparatus 100 by reading out and executing programs and parameters from the storage unit 107. Further, the control unit 106 may realize a part or all of the operations of each functional block of the imaging apparatus 100 by executing a program.

  The storage unit 107 is a storage medium that stores a program, parameters, and data for the operation of the imaging apparatus 100. The storage unit 107 is, for example, a nonvolatile storage medium. Note that the storage unit 107 may be a combination of a volatile storage medium and a nonvolatile storage medium.

  The display unit 108 displays a notification to the user.

  The resynchronization receiving unit 109 receives a user instruction whether or not to change the reference device via the operation unit 110, and when there is a user instruction for changing the reference device, the resynchronization receiving unit 109 instructs the reference device determination unit 104 to change the reference device. Instruct.

  FIG. 6 is a block diagram illustrating functional blocks of the display device 200. The display device 200 includes a communication unit 201, a jitter absorption unit 202, a decoding unit 203, a delay processing unit 204, a signal processing unit 205, a display unit 206, a processing time acquisition unit 208, a reception time acquisition unit 209, and a display time acquisition unit 210. Is provided. The display device 200 further includes a report generation unit 211, a setting acquisition unit 212, a reference device determination unit 213, a delay amount calculation unit 214, an operation unit 215, a control unit 216, a storage unit 217, and an input switching unit 218.

  The communication unit 201 is a communication interface for connecting to the LAN cable 300 and transmitting / receiving signals via the IP network 400. The communication unit 201 outputs the received RTP packetized video signal to the jitter absorption unit 202. At this time, the communication unit 201 outputs the reception time at which the RTP packetized video signal is received and information for specifying the corresponding RTP packetized video signal to the reception time acquisition unit 209. As shown in FIG. 1, the display device 200c receives video signals from the imaging devices 100a and 100b via the LAN cable 300c. Therefore, in this case, as shown in FIG. 6, only one video signal received by the input switching unit 218 provided between the communication unit 201 and the jitter absorbing unit 202 is transmitted to the jitter absorbing unit 202.

  The communication unit 201 outputs the report information 500 acquired from the report generation unit 211 to the imaging device 100 via the IP network 400. In addition, the communication unit 201 acquires setting information 600 from the imaging apparatus 100 via the IP network 400 and outputs the setting information 600 to the setting acquisition unit 212.

  The jitter absorbing unit 202 is a jitter absorbing buffer for preventing propagation of jitter at the time of receiving RTP packets caused by communication jitter between the LAN cable 300 and the connected IP network 400.

  The decoding unit 203 decodes the RTP packetized video signal.

  The delay processing unit 204 includes a memory, temporarily stores the video signal restored by the decoding unit 203 in the memory, and adds a delay amount to the video signal, so that the display unit 206 receives an image after receiving the video signal. Delays the processing time until is displayed. Thereby, the timing of image display on the display unit 206 can be adjusted and synchronized with the display of another display device. The delay amount is acquired from a delay amount calculation unit 214 described later.

  The signal processing unit 205 performs signal processing such as correction on the video signal to which the delay amount is given by the delay processing unit 204. The signal processing unit 205 outputs the video signal subjected to the signal processing to the display unit 206.

  The display unit 206 is a display device that displays an image based on the acquired video signal. For example, the display unit 206 is an organic EL display module. The display unit 206 may be a video output terminal that outputs a video signal to an external display device and displays an image on the display device. The display unit 206 displays, on the display time acquisition unit 210, the display time when the image is displayed (display processing is executed) based on the RTP packetized video signal and the information specifying the corresponding RTP packetized video signal. Output.

  The processing time acquisition unit 208 acquires the processing times in the jitter absorption unit 202, the decoding unit 203, and the signal processing unit 205, and notifies the delay amount calculation unit 214 of the acquired processing times.

  The reception time acquisition unit 209 acquires the reception time at which the RTP packetized video signal is received and information for specifying the corresponding RTP packetized video signal, and passes through a signal line (not shown in FIG. 6). Store in the storage unit 217.

  The display time acquisition unit 210 acquires the display time when the image is displayed (execution of the display process) based on the RTP packetized video signal and the information for specifying the corresponding RTP packetized video signal, Store in the storage unit 217.

  The report generation unit 211 reads information (RTP timestamp) indicating a target RTP packetized video signal, corresponding reception time and display time from the storage unit 217 via a signal line (not illustrated in FIG. 6). . In addition, the report generation unit 211 reads out a synchronization group ID of a preset synchronization group from the storage unit 217. The report generation unit 211 generates report information 500 based on information (RTP timestamp) indicating the target RTP packetized video signal, the corresponding reception time and display time, and the read synchronization group ID. . The report generation unit 211 outputs report information 500 to the communication unit 201. The communication unit 201 outputs the report information 500 to the imaging device 100 via the IP network 400. Further, the report generation unit 211 stores the report information 500 output to the storage unit 217.

  The setting acquisition unit 212 acquires setting information 600 transmitted by the imaging apparatus 100 via the communication unit 201. The setting acquisition unit 212 outputs the setting information to the reference device determination unit 213 and the delay amount calculation unit 214.

  The reference device determination unit 213 compares the received setting information 600 with the transmitted report information 500 stored in the storage unit 217. When there is transmitted report information 500 that matches the received setting information 600, it is determined that the display device 200 is a reference device in the synchronization group. The reference device determination unit 213 stores the determination result in the storage unit 217 and notifies the delay amount calculation unit 214.

  The delay amount calculation unit 214 determines the delay amount to be added to the video signal by the delay processing unit 204. The delay amount calculation unit 214 sets the delay amount to 0 when the reference device determination unit 213 determines that the display device 200 is a reference device in the synchronization group. The delay amount provided by the delay processing unit 204 is determined. When the reference device determination unit 213 determines that the display device 200 is not a reference device in the synchronization group, the delay amount calculation unit 214 determines the delay amount based on the setting information 600. Specifically, the delay amount calculation unit 214 identifies the target RTP packetized video signal based on the target signal information 603 of the setting information 600, and displays it on the reference device based on the corresponding processing time information 604. Time Ta is acquired. In addition, the delay amount calculation unit 214 acquires the display time Tb at which the image is displayed on the display unit 206 based on the RTP packetized video signal specified from the storage unit 217. The delay amount calculation unit 214 determines the difference between the display time Ta and the display time Tb as the delay amount.

  The operation unit 215 is an operation unit for the user to input an instruction for each functional block of the display device 200. As for the display device 200c, the operation unit 215 provides a user instruction (hereinafter referred to as “video display instruction”) as to whether an image based on a video signal from the imaging device 100a or 100b is displayed on the display unit 206. Accept.

  The control unit 216 is a processor that is connected to the display device 200 via a bus (not shown) and controls the operation of each functional block. The control unit 216 is a central processing unit (CPU). For the display device 200c, the control unit 216 selects a video signal from any of the imaging devices 100a and 100b as a video signal to be transmitted to the jitter absorbing unit 202 based on the video display instruction received by the operation unit 215. To the input switching unit 218. The control unit 216 controls the operation of each functional block of the display device 200 by reading out and executing programs and parameters from the storage unit 217. In addition, the control unit 216 may realize part or all of the operations of each functional block of the display device 200 by executing a program read from the storage unit 217.

  The storage unit 217 is a storage medium that stores a program, parameters, and data for the operation of the display device 200. The storage unit 217 is, for example, a nonvolatile storage medium. Note that the storage unit 217 may be a combination of a volatile storage medium and a nonvolatile storage medium.

  The input switching unit 218 selects a video signal designated as a display target on the display unit 206 by the control unit 216 from the video signals output from the imaging apparatus 100 and received by the communication unit 201, and transmits the selected video signal to the jitter absorbing unit 202. To do.

  According to the transmission / reception system of FIG. 1, the video signal output from the imaging device 100a can be displayed in synchronization with each of the display devices 200a to 200c. The transmission / reception of the report information 500, the transmission / reception of the setting information 600 in response thereto, and the delay amount control are executed at a predetermined cycle. Thereby, even when the processing time in each of the display devices 200a to 200c fluctuates, it is possible to maintain display synchronization.

  In the transmission / reception system of FIG. 1, when the processing time of the reference device fluctuates for some reason, such as when the display device determined as the reference device leaves the synchronization group, the delay amount of the other display devices in the synchronization group becomes the fluctuation. Adjusted to correspond.

  In the transmission / reception system of FIG. 1, as described above, the display devices 200a to 200c belong to one synchronization group A and display images based on the video signal output from the imaging device 100a in synchronization. The display devices 200d and 200e belong to the synchronization group B different from the synchronization group A, and display images based on the video signal output from the imaging device 100b in synchronization. In this state, a synchronization group leaving process when the operation unit 215 of the display device 200c receives a video display instruction will be described with reference to FIGS.

  FIG. 7 is a flowchart showing the procedure of the synchronization group leaving process executed in the display device 200c. This process is executed when the control unit 216 in FIG. 6 that controls the entire display device 200c reads a program held in the storage unit 217. Hereinafter, the value of the synchronization group ID of the synchronization group A is A, and the value of the synchronization group ID of the synchronization group B is B.

  In FIG. 7, first, the control unit 216 determines whether to switch the display of the display unit 206 based on the video display instruction received by the operation unit 215 (step S <b> 701). That is, it is determined whether or not the current synchronization group A transitions to the synchronization group B and the display on the display unit 206 is switched to an image based on the video signal from the imaging device 100b based on the video signal from the imaging device 100a. In this embodiment, the determination in step S701 is performed based on the video display instruction, but is not limited to this. For example, when a new video signal is not received from the imaging device 100a for a certain period of time, it may be determined that the display of the display unit 206 is switched in step S701.

  When it is determined that the display on the display unit 206 is not switched (No in step S701), the process proceeds to step S702. In step S702, the control unit 216 instructs the input switching unit 218 to select the video signal from the imaging device 100a as the video signal to be transmitted to the jitter absorbing unit 202, and the display unit 206 is based on the video signal from the imaging device 100a. Display an image.

  Thereafter, when the report generation unit 211 generates the report information 500, the communication unit 201 transmits the report information 500 to the imaging device 100a (step S703), and returns to step S701.

  On the other hand, if it is determined to switch the display of the display unit 206 (Yes in step S701), the process proceeds to step S704. In step S704, the control unit 216 instructs the input switching unit 218 to select the video signal from the imaging device 100b as the video signal to be transmitted to the jitter absorption unit 202, and the display unit 206 is based on the video signal from the imaging device 100b. Display an image.

  Thereafter, the report generation unit 211 generates the report information 500, and the communication unit 201 transmits the generated report information 500 to both the imaging devices 100a and 100b (step S705). Here, the report generation unit 211 generates report information 500 (hereinafter referred to as report information 500b) transmitted to the imaging apparatus 100b based on a video signal from the imaging apparatus 100b. Further, report information 500 (hereinafter referred to as report information 500a) transmitted to the imaging apparatus 100a is generated based on a video signal from the imaging apparatus 100a. Note that an image based on the video signal from the imaging device 100a is not displayed on the display unit 206 in step S704. Therefore, the time displayed when it is assumed that the image is displayed on the display unit 206 is calculated, and the calculated time is set as the processing time information 504 of the report information 500a transmitted to the imaging apparatus 100a. Specifically, the control unit 216 is based on the video signal previously displayed on the display unit 206 and stored in the storage unit 217 at the RTP packet reception time from the imaging device 100a acquired by the reception time acquisition unit 209. Calculate by adding the delay amount for the image.

  The setting acquisition unit 212 receives the setting information 600 transmitted by the imaging devices 100a and 100b via the communication unit 201 (step S706). Hereinafter, the setting information 600 transmitted by the imaging apparatus 100a is referred to as setting information 600a, and the setting information 600 transmitted by the imaging apparatus 100b is referred to as setting information 600b.

  Next, the reference device determination unit 213 determines whether or not the display device 200c is a reference device of the synchronization group A to which the display device 200c belongs before switching the display on the display unit (step S707). Specifically, the determination first compares the setting information 600a received from the imaging device 100a in step S706 with the report information 500a generated in step S705 and transmitted to the imaging device 100a. As a result of this comparison, when all items shown in FIGS. 3A and 3B match, the display device 200c determines that the reference device is the synchronization group A. Otherwise, the display device 200c determines that the synchronization group A is the reference device. Is not a reference device. Note that steps S705 and S706 may be omitted if the determination in step S707 is possible after switching the display of the display unit 206 in step S701. For example, before switching the display of the display unit 206 in step S701, the report information transmitted to the imaging device 100a is compared with the setting information transmitted from the imaging device 100a in response thereto. As a result of this comparison, if all items of both pieces of information are the same, information indicating that the own device is the reference device of the synchronization group A may be stored in the storage unit 217 in advance.

  As a result of the determination in step S707, if the display device 200c is a reference device of the synchronization group A, the process proceeds to step S708. Otherwise, the process proceeds to step S709.

  In step S708, the report generation unit 211 changes the synchronization group ID of the report information 500 transmitted to the imaging apparatus 100a in step S705 to Empty, and the communication unit 201 transmits the changed report information to the imaging apparatus 100a. . By setting the synchronization group ID to Empty, the display device 200c indicates to the imaging device 100a that it will leave at least the synchronization group A to which it currently belongs. Thereafter, the process returns to step S704. The imaging device 100a that has received the report information 500 in which Empty is described as the synchronization group ID sets the value of the synchronization group ID to be added to the setting information for the display device 200c that has transmitted the report information 500 to C. In this embodiment, the synchronization group ID to be changed in step S708 is Empty. However, the present invention is not limited to Empty as long as it is a value indicating to the imaging apparatus 100a that the current synchronization group A belongs. For example, the synchronization group ID may be different from the value indicating either of the synchronization groups A and B, for example, C.

  After performing the processing of step S708, the reference device determination unit 213 determines whether or not all items except the synchronization group ID among the items shown in FIGS. 3A and 3B match in step S707. Judging. If all items except the synchronization group ID match, it is determined that the display device 200c remains the reference device of the synchronization group A (Yes in step S707), and the process proceeds to step S708 again. That is, in this case, the control unit 216 (repetition unit) controls the report generation unit 211, the communication unit 201, and the setting acquisition unit 212 to repeat transmission of report information in step S708 and reception of setting information in step S706. Control. On the other hand, if any item other than the synchronization group ID is different, it is determined that the display device 200c is no longer a reference device of the synchronization group A (No in step S707), and the process proceeds to step S709.

  If it is determined as Yes in step S707, the process may return to step S704 without executing step S708. In this case, the processing time is calculated again when it is assumed that an image based on the video signal acquired from the imaging device 200a in step S705 is displayed on the display unit 108, and is output to the imaging device 200a as report information 500a. Thereafter, the processes of steps S706 and S707 are executed. In step S707, the setting information 600a of the synchronization group A is compared with the transmitted report information 500a to determine again whether or not the display device 200c is the reference device of the synchronization group A. By repeating steps S704 to S707 as described above, the processing may be executed so that the display device 200c remains the reference device of the synchronization group A until the display device 200c is no longer the reference device of the synchronization group A. That is, even after the display device 200c switches the output device of the video signal used for displaying the image, the display is continued until another display device of the synchronization group A to which the display device 200c belongs before becoming the reference device. This means that the device 200c continues to be a reference device.

  In step S709, the communication unit 201 stops transmission of the report information 500 to the imaging device 100a (step S709), and ends this process.

  According to the processing of FIG. 7, when the display device 200 c leaves the synchronization group A, the display device 200 c repeats transmission of report information and reception of setting information in the synchronization group A until the own device is no longer a reference device in the synchronization group A. That is, even when the display device 200c that is the reference device of the synchronization group A leaves the synchronization group A, the transmission of the report information in the synchronization group A from the display device 200c is not suddenly stopped. For this reason, disturbance of the display timing of the video signal in the other display devices 200a and 200b of the synchronization group A can be prevented.

  FIG. 8 is a flowchart illustrating the procedure of the synchronization group leaving process executed in the imaging apparatus 100a. This process is executed by reading a program held in the storage unit 107 by the control unit 106 shown in FIG.

  The communication unit 103 receives the report information 500 transmitted from each of the display devices 200a to 200c (step S801). For example, the report information 500a is received from the display device 200c output in step S708. The received report information 500 is temporarily stored in the storage unit 107.

  The information generation unit 105 generates setting information 600 from the received report information 500. Then, the communication unit 103 transmits the setting information 600 to the display devices 200a to 200c (step S802). Note that the report information 500a output in step S708 may be received from the display device 200c. In this case, the information generation unit 105 generates setting information 600a in which the value of the synchronization group ID is set to C as setting information 600 to be transmitted to the display device 200c. However, the other items of the setting information 600a are the same as the setting information 600 transmitted to the display devices 200a and 200b. That is, the setting information 600a transmitted to the display device 200c here is information indicating that the reference device is the display device 200c, but the value of the synchronization group ID is C instead of A.

  The control unit 106 determines whether or not the reference device is leaving the synchronization group A (step S803). Specifically, first, it is determined whether or not the report information 500 in which Empty is described as the synchronization group ID is included in the report information 500 temporarily stored in the storage unit 107. If the report information is included as a result of this determination, it is determined that the transmission source of the report information 500 (display device 200c in this embodiment) is a reference device and is about to leave the synchronization group A.

  If it is determined that the reference device is about to leave the synchronization group A (Yes in step S803), the control unit 106 displays a screen asking the user whether or not to change the reference device on the display unit 108 (inquiry unit). It is displayed (step S804). On the other hand, if not (No in step S803), the process returns to step S801.

  The resynchronization receiving unit 109 determines whether or not to change the reference device according to the user instruction received via the operation unit 110 (step S805). If the received user instruction is an instruction to change the reference device, it is determined that the reference device is to be changed, and the process proceeds to step S806. Otherwise, it is determined that the reference device is not to be changed, and the process returns to step S801.

  In step S806, the display devices 200a and 200b are resynchronized and the process is terminated. Specifically, step S806 is performed as follows. First, the resynchronization reception unit 109 instructs the reference device determination unit 104 to change the reference device. In response to this instruction, the reference device determination unit 104 determines a display device other than the display device 200c that is the current reference device of the synchronization group A, that is, one of the display devices 200a and 200b as a reference device. The information generation unit 105 generates setting information 600 based on the report information 500 from the determined reference device. The communication unit 103 transmits the setting information 600 to the display devices 200a to 200c. Here, the information generation unit 105 sets the value of the synchronization group ID of the setting information 600 transmitted to the display device 200c to C. However, the other items are the same as the setting information transmitted to the display devices 200a and 200b. That is, the setting information transmitted to the display device 200c here is setting information in which the reference device is one of the display devices 200b and 200c, and the value of the synchronization group ID is C instead of A.

  According to the process of FIG. 8, when the display device 200c as the reference device is about to leave the synchronization group A, the display devices 200a and 200b other than the display device 200c in the synchronization group A are resynchronized. As a result, the reference device can be quickly changed from the display device 200c to another display device of the synchronization group A.

  Further, according to this process, the setting information 600 transmitted to the display device 200c when the display devices 200a and 200b are resynchronized in step S806 is transmitted to the display device 200c in step S802 before the resynchronization. Different from the information 600. As a result, the reference device determination unit 213 can reliably determine whether or not the own device is no longer a reference device in the synchronization group A in step S707. That is, when the setting information 600 is transmitted from the imaging device 100a to the display device 200c in step S806, it is determined that the reference device of the synchronization group A has been changed on the display device 200c side.

  Furthermore, according to this process, before resynchronization of the display devices 200a and 200b in step S806, the user is inquired whether to change the reference device in step S804. Accordingly, it is possible to prevent the display display 200a and 200b caused by the resynchronization from occurring in the display disorder of the image based on the video signal from the imaging device 100a at a timing not intended by the user.

  As described above, according to this embodiment, the report information generated from the display device 200c to the imaging device 100a in step S708 until it is determined that the reference device of the synchronization group A has been changed on the display device 200c side. 500 is repeatedly transmitted. Thereby, even if the display device 200c which is the reference device of the synchronization group A leaves the synchronization group A, the transmission of the report information in the synchronization group A from the display device 200c is not suddenly stopped. For this reason, disorder of the synchronization process between the other display devices 200a and 200b in the synchronization group A can be prevented.

  Although the present invention has been described in detail based on the preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A configuration may be adopted in which the user can select and control a function from a display such as a menu.

[Other Examples]
It goes without saying that the object of the present invention can also be achieved by supplying a storage medium storing software program codes for realizing the functions of the above-described embodiments to the apparatus. At this time, the computer (or CPU or MPU) including the control unit of the supplied apparatus reads and executes the program code stored in the storage medium.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  Further, the OS (basic system or operating system) running on the apparatus performs part or all of the processing based on the instruction of the program code described above, and the functions of the above-described embodiments are realized by the processing. Needless to say, cases are also included.

  Further, the program code read from the storage medium may be written into a memory provided in a function expansion board inserted into the apparatus or a function expansion unit connected to the computer, and the functions of the above-described embodiments may be realized. Needless to say, it is included. At this time, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

100a, 100b Imaging device 200a-200e Display device 300a-300g LAN cable 106 Control unit 108 Display unit 109 Resynchronization reception unit 209 Reception time acquisition unit 211 Report generation unit 216 Control unit 217 Storage unit 218 Input switching unit 400 IP network

Claims (11)

A processing device connected to a plurality of output devices and performing predetermined processing on a video signal received from any of the plurality of output devices in synchronization with other processing devices of a synchronization group to which the own device belongs,
Receiving means for receiving a plurality of video signals and a plurality of setting information corresponding to each of the plurality of output devices from the plurality of output devices;
A selection means for selecting a video signal for performing the predetermined processing from the plurality of video signals;
Processing means for executing the predetermined processing on the selected video signal at a timing based on the setting information corresponding to the selected video signal among the plurality of setting information;
Transmitting means for transmitting report information related to an execution time of the predetermined processing on the selected video signal by the processing means to the output device that has output the selected video signal among the plurality of output devices; ,
Determination means for determining whether the own device is a reference device of the synchronization group based on the report information transmitted by the transmission unit and a plurality of setting information received by the reception unit;
After the selection means switches the video signal for executing the predetermined processing from the first video signal of the plurality of video signals to the second video signal, and the determination means determines that the own device When it is determined that the reference device is the reference device for the synchronization group of the first output device that outputs one video signal, the transmission means determines that the determination device is not the reference device for the synchronization group of the first output device. Until the first output information is transmitted to the first output device as the report information and the second video signal is output. A processing apparatus, wherein second report information relating to an execution time of the predetermined process on the second video signal is transmitted to the output apparatus as the report information. Before the selection means switches the video signal for executing the predetermined processing from the first video signal to the second video signal, the first video signal is received until the predetermined processing is executed. It further comprises holding means for holding the delay amount,
The transmission means calculates an execution time of the predetermined process on the first video signal based on the reception time of the first video signal by the reception means and the held delay amount, and the calculated execution 2. The processing apparatus according to claim 1, wherein a synchronization group ID indicating a time and a synchronization group of the first output device is included in the first report information.   The determination unit is configured such that when there is setting information that matches the first report information except for a synchronization group ID among a plurality of setting information received by the reception unit, the own unit detects the synchronization group of the first output device. The processing device according to claim 1, wherein the processing device is determined to be a reference device.   The transmission means includes the first synchronization information transmitted after the determination means determines that the own apparatus is a reference device of the synchronization group of the first output device, and includes an empty synchronization group ID. The processing apparatus according to any one of claims 1 to 3. An output device that connects to a plurality of processing devices and transmits a video signal that is subjected to predetermined processing in synchronization with the processing device of the own synchronization group among the plurality of processing devices,
Receiving means for receiving report information from the processing device of the own synchronization group;
Based on the received report information, determining means for determining a reference device of the synchronization group of the own device;
First transmission means for transmitting the report information from the determined reference device to the processing device of the synchronization group of the own device as setting information;
A first processing device that is one of the plurality of processing devices based on the report information received by the receiving device is the reference device, and a determination device that determines whether or not it is about to leave the synchronization group of the own device; ,
If the determination means determines that the first processing device is the reference device and is about to leave the synchronization group of the own device, inquiry means for changing the reference device or inquiring the user;
Receiving means for receiving a user instruction for the inquiry,
When the instruction to change the reference device is received as the user instruction by the reception unit, the determination unit selects one of the processing devices excluding the first processing device from the processing devices of the synchronization group of the own device. The first transmitting means transmits, as the setting information, first setting information including a synchronization group ID having a value other than a value indicating the synchronization group of the own device, to the first processing device. Transmitting second setting information including a synchronization group ID, which is a value indicating the synchronization group of the own device, to the processing devices other than the first processing device among the processing devices of the synchronization group of the own device as the setting information. Characteristic output device.   When the determination means receives, as the report information, first report information including an empty synchronization group ID from the first processing device, the first processing device is the reference device and will leave the synchronization group. The output device according to claim 5, wherein the output device is determined to be. A video comprising a plurality of output devices and a plurality of processing devices, the first processing device being one of the plurality of processing devices being connected to the plurality of output devices and received from any of the plurality of output devices A synchronization control system that performs predetermined processing on a signal in synchronization with another processing device of a synchronization group to which the own device belongs,
In the first processing apparatus,
First receiving means for receiving a plurality of video signals and a plurality of setting information corresponding to each of the plurality of output devices from the plurality of output devices;
A selection means for selecting a video signal for performing the predetermined processing from the plurality of video signals;
Processing means for executing the predetermined processing on the selected video signal at a timing based on the setting information corresponding to the selected video signal among the plurality of setting information;
A report information related to an execution time of the predetermined process on the selected video signal by the processing means is transmitted to the output device that has output the selected video signal among the plurality of output devices. A transmission means;
First determining whether or not the own device is a reference device of the synchronization group based on the report information transmitted by the first transmission unit and a plurality of setting information received by the first reception unit. Determination means,
After the selection means switches the video signal for executing the predetermined processing from the first video signal of the plurality of video signals to the second video signal, and the first determination means Is determined to be a reference device of a synchronization group of the first output device that outputs the first video signal, the first transmission means is configured to use the first output device as the first determination means. The first report information related to the execution time of the predetermined processing on the first video signal is transmitted to the first output device as the report information until it is determined that the reference device is not a reference device of the synchronization group of Transmitting, as the report information, second report information related to an execution time of the predetermined processing on the second video signal to a second output device that outputs the second video signal;
In the first output device,
A second receiving means for receiving the report information from a processing device of the own synchronization group among the plurality of processing devices;
Determining means for determining a reference device of the synchronization group of the own device based on the received report information;
Second transmission means for transmitting the report information from the determined reference device as setting information corresponding to the first video signal to a processing device of the own synchronization group;
Second determination means for determining whether or not the first processing device is the reference device and is about to leave the synchronization group of the own device based on the report information received by the second receiving means;
When the second determination means determines that the first processing device is the reference device and is about to leave the synchronization group of the own device, inquiry means for changing the reference device or inquiring the user;
Receiving means for receiving a user instruction for the inquiry,
When the instruction to change the reference device is received as the user instruction by the reception unit, the determination unit selects one of the processing devices excluding the first processing device from the processing devices of the synchronization group of the own device. The reference device is determined, and the second transmission means transmits, as the setting information, first setting information including a synchronization group ID of a value other than a value indicating the synchronization group of the own device to the first processing device, In addition, second setting information including a synchronization group ID which is a value indicating the synchronization group of the own device is transmitted as the setting information to processing devices other than the first processing device among the processing devices of the synchronization group of the own device. A synchronous control system characterized by A processing apparatus control method for connecting a plurality of output devices and performing predetermined processing on a video signal received from any of the plurality of output devices in synchronization with other processing devices of a synchronization group to which the own device belongs. There,
Receiving a plurality of video signals and a plurality of setting information corresponding to each of the plurality of output devices from the plurality of output devices;
A selection step of selecting a video signal for performing the predetermined processing among the plurality of video signals;
A processing step of executing the predetermined processing on the selected video signal at a timing based on the setting information corresponding to the selected video signal among the plurality of setting information;
A transmission step of transmitting report information related to an execution time of the predetermined processing for the selected video signal to the output device that has output the selected video signal among the plurality of output devices;
A determination step of determining whether the own device is a reference device of the synchronization group based on the report information transmitted in the transmission step and a plurality of setting information received in the reception step. ,
In the selection step, after the video signal for executing the predetermined processing is switched from the first video signal to the second video signal among the plurality of video signals, and in the determination step, When it is determined that it is a reference device of a synchronization group of the first output device that outputs the first video signal, in the transmission step, the own device is not a reference device of the synchronization group of the first output device in the determination step Until it is determined that the first report information related to the execution time of the predetermined processing on the first video signal is transmitted to the first output device as the report information, and the second video signal is output. The second report information related to the execution time of the predetermined processing on the second video signal is transmitted to the second output device as the report information. Your way. A control method for an output device, which is connected to a plurality of processing devices, and transmits a video signal to be subjected to a predetermined process synchronously to a processing device of its own synchronization group among the plurality of processing devices,
A receiving step of receiving report information from the processing device of the synchronization group of the own device;
A determination step of determining a reference device of the synchronization group of the own device based on the received report information;
A first transmission step of transmitting the report information from the determined reference device as setting information to the processing device of the own synchronization group;
A determination step of determining whether or not a first processing device, which is one of the plurality of processing devices, is the reference device and is about to leave the synchronization group of the own device based on the report information received in the reception step. When,
In the determination step, when it is determined that the first processing device is the reference device and is about to leave the synchronization group of the own device, an inquiry step for changing the reference device or inquiring a user;
Receiving a user instruction for the inquiry,
When an instruction to change the reference device is received as the user instruction in the receiving step, one of the processing devices excluding the first processing device among the processing devices of the synchronization group of the own device is First setting information is determined as a reference device, and in the first transmission step, first setting information including a synchronization group ID having a value other than a value indicating the synchronization group of the own device is transmitted to the first processing device as the setting information. In addition, second setting information including a synchronization group ID, which is a value indicating the synchronization group of the own device, is transmitted as the setting information to processing devices other than the first processing device among the processing devices of the own synchronization group. A control method characterized by that. A video comprising a plurality of output devices and a plurality of processing devices, the first processing device being one of the plurality of processing devices being connected to the plurality of output devices and received from any of the plurality of output devices A control method of a synchronous control system that performs predetermined processing on a signal in synchronization with another processing device of a synchronization group to which the own device belongs,
In the first processing apparatus,
A first receiving step of receiving a plurality of video signals and a plurality of setting information corresponding to each of the plurality of output devices from the plurality of output devices;
A selection step of selecting a video signal for performing the predetermined processing among the plurality of video signals;
A processing step of executing the predetermined processing on the selected video signal at a timing based on the setting information corresponding to the selected video signal among the plurality of setting information;
A first transmission step of transmitting report information related to an execution time of the predetermined process for the selected video signal to the output device that has output the selected video signal among the plurality of output devices;
Based on the report information transmitted in the first transmission step and a plurality of setting information received in the first reception step, it is determined whether the own device is a reference device of the synchronization group. A first determination step,
In the selection step, after the video signal for executing the predetermined processing is switched from the first video signal to the second video signal among the plurality of video signals, and in the first determination step. When it is determined that the device is a reference device of the synchronization group of the first output device that outputs the first video signal, in the first transmission step, the own device is the first determination step in the first determination step. The first report information related to the execution time of the predetermined processing on the first video signal is transmitted to the first output device as the report information until it is determined that the output device is not a reference device of the synchronization group. In addition, second report information related to the execution time of the predetermined processing on the second video signal is transmitted as the report information to the second output device that outputs the second video signal.
In the first output device,
A second receiving step of receiving the report information from a processing device of the own synchronization group among the plurality of processing devices;
A determination step of determining a reference device of the synchronization group of the own device based on the received report information;
A second transmission step of transmitting the report information from the determined reference device to the processing device of the own synchronization group as setting information corresponding to the first video signal;
A second determination step of determining whether or not the first processing device is the reference device based on the report information received in the second reception step and is about to leave the synchronization group of the own device;
In the second determination step, when it is determined that the first processing device is the reference device and is going to leave the synchronization group of the own device, an inquiry step for changing the reference device or inquiring a user; ,
Receiving a user instruction for the inquiry,
When an instruction to change the reference device is received as the user instruction in the receiving step, one of the processing devices excluding the first processing device among the processing devices of the synchronization group of the own device is First setting information determined as a reference device, and in the second transmission step, first setting information including a synchronization group ID having a value other than a value indicating the synchronization group of the own device is transmitted to the first processing device as the setting information. Second setting information including a synchronization group ID that is a value indicating the synchronization group of the own device is transmitted as the setting information to processing devices other than the first processing device among the processing devices of the synchronization group of the own device. A control method characterized by that.   The program which performs the control method of any one of Claims 8 thru | or 10.

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